Pawl-and-ratchet mechanism.



' Patented Feb.` Il, |902. R. F.. BABKER. 1 l 'PAWL AND BATCHET IIECHANISM.

(Apph t nldA g 20 1901) (No Model.) i

UNTTED STATES RUBEN F. BAKKER, OF MARINETTE,

TO MICHAEL OORRY, OF

PATENT OFFICE.-

WISCONSIN, ASSIGNOR OF ONE-HALF MARINETTE, VISOONSIN.

PAWLWAND-RATCHETl NIECHANISIVI.

SPECIFICATION forming part of Letters Patent N 0. 693,344, dated Februaryl 11, 1902.

l Application filed August 20, 1901. Serial No. 72.667. (No model.) l

To f/,ZZ 11171/0711, 717 infn/,7] concern: y

Be it known that l, RUBEN F. BAKKER, a citizen ot' the United States, and a resident of Marinette, county of Marinette, and State of lVisconsin, have invented certain new and useful Improvements in Pawl-and-Ratchet Mechanism, of which the following is a speciiicaton and which are illustrated in the accompanying drawings, forminga part thereof.

This inven tion relatesto a paWl-and-ratchet mechanism such as is employed, for example, with a sawmill set-works, and has for its object to provide means for simultaneously disengaging the pawls from the ratchet-wheel thereof. This object is attained by means of an expansible band engaging the pawls to lift them out of the ratchet-teeth, and specilically by means ot' the mechanism hereinafter described and which is illustrated in the accompanying drawings, in which- Figure 1 shows a detail sectional view of the ratchet mechanism as employed with a sawmill set-works. Fig. 2 is a sectional view on the line 2 2 of Fig. 1, and Fig. 3 is a detail showing a modified form of construction.

I have illustrated the invention as adapted to a sawmill setworks,and at 10 there is shown the ordinary set-shaft of a sawmill-carriage, at 11 a rocker-shaft such as is commonly employed in devices of this kind, and at 12 a ratchet-wheel mounted upon the set-shaft. This ratchet-Wheel is provided with a circumferential channel 13, dividing its face into two sections. Mounted upon the ends of the hub ot' the wheel 12l are a pair ot' pawl-carriers 14 15,. each overlapping one of the sets of ratchet-teeth on the face of the wheel. These pawl-carriers are oscillated by means of crank-arms 16, fixed upon the rocker-shaft 11, to which they are connected, respectively, by means of the links 17 1S. Each of the pawl-carriers is pro vided with a set of springpawls, as 10 20,which coperate with the teeth ot' the ratchet-wheel, each of the pawls somewhat overlapping the channel 13.

Lying within the channel 13 is a band or member 13a, preferably non-elastic and secured to a fixed anchorage, as 25.. This band is provided with a plurality of circumferentially-arranged cam-faces, and in the present instance these are secured by notching the periphery of the band, as shown at 22, each notch being provided with a face oblique to the radius of the wheel 12. V

Encircling the band 13 and normally lying` within the channel 13 there is an expansible band 21, of spring metal, this band being normally of less circumference than the band 13a. The band 21 is provided with a series of inwardly-projecting cam-faces, in the present instance secured by means of blocks 23, each having a face inclined to the diameter and adapted to slide upon the inclined faces of the notches 22. This band is of sufhcient width to engage both sets of ratchet-teeth, so that as it is expanded by the sliding of its cam-blocks 23 upwardly upon the 'inclined faces of the notches 22 the pawls will b e lifted out of the ratchet-teeth. V

A hand-lever 211, pivoted to a fixed support, as 25, is connected by means of alink 26 with the band 21 and serves as means for oscillating the latter.

illustrated and described for expanding the pawl-liftingband. This maybeaccomplished in a Variety of ways-as, for example, bythe mechanism illustrated in Fig. 3, wherein two links 27 28 are shown as leading from the hand-lever 24, one upon each side of its fulcru m', to the opposite ends of the band, so that the oscillation of the lever moves the two endsl of the band in opposite directions to cause its expansion and contraction.

I claim as my invention- A l 1. In a pawl-and-ratchet mechanism, in combination, a shaft, a ratchet-wheel mounted thereon, pawls cooperating with the wheel, an elastic band engaging the pawls, and means for varying the diameter of the band.

2. In a pawl-and-ratchet mechanism, in combination, a shaft, a ratchet-wheel fixed thereon, pawls cooperating with the wheel, a stationary band encircling the wheel and having cam-faces on its periphery, an expansible band Vencircling the wheel and engaging the pawls and having cam-faces bearing on the cam-faces of the stationary band, and means for oscillating-the expansible band.

3. In a pawl-and-ratchet mechanism, in combination, a shaft, a ratchet-wheel mounted thereon, pawls cooperating with the ratchetwheel, a pair of bands encircling the wheel and having mu tually-on ga ging cam-faces, one

Ido notlimitmyselt to the particular means n Ico ol.' snch banda1 being` expansible and engaging the pawls, and meansl for moving` sneh hande relatively cireninferentially.

lV- ln a pawl-aml-ratchet mechanism, in combination, a ratchet-wheel having' a cirenmierential channel in its lace, two sets of pawls each engaging teeth on one side ot' the channel and overl apping; the latter, two bands within the channel and having mutually-engaging; cam-faces, one ot' such bauds being expansible and engaging the pawls, and means toi' relatively moving` the two bands circnml'erentially.

5. In a pawl-and-ratchet mechanism, in combination, a ratchet-wheel having its l'ace circumferential ly channeled,t\vo sets of pawls cooperatingY with the ratchet-teeth on opposite sides of the channel and overlapping;` the latter, a band located within the channel and having periphere'il cam-faces ancl a fixed anchorage, an expannible hand encircling the lixeil bami :tml bearing' upon its mun-laces and engagingthe pawls, and a hand-lever attached to the expansible band.

t3. In a ratchet mechanism, in combination, a shaft, a ratchet-wheel mounted thereon, pawls coiperatingr with the wheel, a stationary member', an expansible band encirclingl the wheel and engaging' the pawls, and coacting means between the Statiol'iary member and the band for expanding the latter when oscillated.

7. In a ratchet mechanism, in combination` a shaft, a ratchet-wheel mounted thereon, pawls cooperating with the wheel, a stationary member, an expansible band encircling' the wheel and engaging the pawls, and coaeting cam-faces between the stationary member and the band l'or expanding the latter when oscillated.

HUIZEN l. BANKEN. W itnesses:

W. W. SliiNNnn, M. O. 'Kefir/uni. 

